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    Prostate cancer cells preferentially home to osteoblast-rich areas in the early stages of bone metastasis: evidence from in vivo models.

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    Authors
    Wang, N
    Docherty, F
    Brown, H
    Reeves, Kimberley J
    Fowles, A
    Ottewell, P
    Dear, T
    Holen, I
    Croucher, P
    Eaton, C
    Affiliation
    The Mellanby Centre for Bone Research, Department of Human Metabolism, The University of Sheffield, Sheffield, UK
    Issue Date
    2014-12
    
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    Abstract
    It has been suggested that metastasis-initiating cells gain a foothold in bone by homing to a metastastatic microenvironment (or "niche"). Whereas the precise nature of this niche remains to be established, it is likely to contain bone cell populations including osteoblasts and osteoclasts. In the mouse tibia, the distribution of osteoblasts on endocortical bone surfaces is non-uniform, and we hypothesize that studying co-localization of individual tumor cells with resident cell populations will reveal the identity of critical cellular components of the niche. In this study, we have mapped the distribution of three human prostate cancer cell lines (PC3-NW1, LN-CaP, and C4 2B4) colonizing the tibiae of athymic mice following intracardiac injection and evaluated their interaction with potential metastatic niches. Prostate cancer cells labeled with the fluorescent cell membrane dye (Vybrant DiD) were found by two-photon microscopy to be engrafted in the tibiae in close proximity (∼40 µm) to bone surfaces and 70% more cancer cells were detected in the lateral compared to the medial endocortical bone regions. This was associated with a 5-fold higher number of osteoblasts and 7-fold higher bone formation rate on the lateral endocortical bone surface compared to the medial side. By disrupting cellular interactions mediated by the chemokine (C-X-C motif) receptor 4 (CXCR4)/chemokine ligand 12 (CXCL12) axis with the CXCR4 inhibitor AMD3100, the preferential homing pattern of prostate cancer cells to osteoblast-rich bone surfaces was disrupted. In this study, we map the location of prostate cancer cells that home to endocortical regions in bone and our data demonstrate that homing of prostate cancer cells is associated with the presence and activity of osteoblast lineage cells, and suggest that therapies targeting osteoblast niches should be considered to prevent development of incurable prostate cancer bone metastases. © 2014 American Society for Bone and Mineral Research.
    Citation
    Prostate cancer cells preferentially home to osteoblast-rich areas in the early stages of bone metastasis: evidence from in vivo models. 2014, 29 (12):2688-96 J Bone Miner Res
    Journal
    Journal of Bone and Mineral Research
    URI
    http://hdl.handle.net/10541/338775
    DOI
    10.1002/jbmr.2300
    PubMed ID
    24956445
    Type
    Book
    Language
    en
    ISSN
    1523-4681
    ae974a485f413a2113503eed53cd6c53
    10.1002/jbmr.2300
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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